MagnaFlow OEM Grade Federal and EPA compliant direct-fit converter 21-989 keeps the check engine light off with free flowing mandrel bent tubing and corrosion resistant stainless construction. The spun body replicates the OE design so a single laser fusion weld reduces leak risk while the compact low-mass build improves thermal efficiency, installing without cutting or welding.
| Type | OEM Grade direct-fit catalytic converter |
| Emissions | Federal / EPA compliant (not for sale in CA or NY) |
| Material | Stainless steel, spun body, mandrel bent |
| Installation | Bolt-on, no cutting or welding |
| Part Number | 21-989 |
| Quantity | 1 |
Documents: Technical Bulletin (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004 | Chevrolet | Silverado 2500 | Base |
| 2004 | Chevrolet | Silverado 2500 | LS |
| 2004 | Chevrolet | Silverado 2500 | LT |
| 2004 | Chevrolet | Silverado 2500 | WT |
| 2001-2005 | Chevrolet | Silverado 2500 HD | Base |
| 2001-2006 | Chevrolet | Silverado 2500 HD | LS |
| 2001-2006 | Chevrolet | Silverado 2500 HD | LT |
| 2003-2006 | Chevrolet | Silverado 2500 HD | WT |
| 2004 | GMC | Sierra 2500 | Base |
| 2004 | GMC | Sierra 2500 | SLE |
| 2004 | GMC | Sierra 2500 | SLT |
| 2004 | GMC | Sierra 2500 | WT |
| 2002-2005 | GMC | Sierra 2500 HD | Base |
| 2001-2002,2006 | GMC | Sierra 2500 HD | SL |
| 2001-2006 | GMC | Sierra 2500 HD | SLE |
| 2001-2006 | GMC | Sierra 2500 HD | SLT |
| 2003-2006 | GMC | Sierra 2500 HD | WT |
